This is a heart shaped ring I made for my daughter for Valentines Day.

The inside diameter is 5/8" (15.875 mm) which comes out to a size 5 1/4. The ring is about 1" (27mm) by a little under 1 1/4" (30mm).

I made the wall count (4) so the ring doesn't break

It fits kids around 4-6 years old.